upward

CoO

T J Smart, T A Pham, Y Ping, T Ogitsu, Optical absorption induced by small polaron formation in transition metal oxides: The case of Co3O4, PRM 3, 102401 (2019)

Cathode

D Ensling, A Thissen, S Laubach, P C Schmidt, W Jaegermann, Electronic structure of LiCoO2 thin films: A combined photoemission spectroscopy and density functional theory study, PRB 73, 174104 (2010)